Heat shrinkable white polyester-based film

Abstract

The present invention aims to provide a heat shrinkable white polyester film which has good and high perforated line openability if fitted as a label, while achieving good label appearance when fitted; and a label. A heat shrinkable white polyester-based film comprising a polyester-based resin having ethylene terephthalate as a main constituent component and containing one or more monomer components that can become amorphous components in an amount of 13 mol % or more of in an entire polyester resin composition, and satisfying the following requirements (1) to (6): (1) the film has a hot water heat shrinkage rate of 0% or more and 15% or less in a longitudinal direction of the film when treated in 98° C. hot water for 10 seconds; (2) the film has a hot water heat shrinkage rate of 50% or more and 80% or less in a width direction of the film when treated in 98° C. hot water for 10 seconds; (3) the film has a trans conformation ratio of 0.3 or more and 0.65 or less in a longitudinal direction, which is a non-shrinkage direction of the film, when a ratio A1/A2 of an absorbance A1 at 1340 cm−1 relative to an absorbance A2 at 1410 cm−1 of the heat shrinkable polyester-based film measured by a polarized ATR-FTIR method is defined as a trans conformation ratio; (4) the film has a total light transmittance of 10% or more and 40% or less; (5) the film has a tensile elongation at break in the longitudinal direction at 1000 mm/min of 70% or more and 300% or less after the film is shrunk by 20% in the width direction in a hot-air oven; (6) the film has a distortion index of the molecular orientation angle of 0 degrees or more and 15 degrees or less.

Dependencies are inferred from the claim text.